Rewriting all requests to index.php

You can use also the try_files (
http://wiki.nginx.org/NginxCoreModule#try_files ) approach:
location / {
try_files $uri $uri/ /index.php?$args;
}
This way you can also have normal directories and static files and nginx
will check first if they exist and if not then use the /index.php in the
root folder.
rr